micromath 2.1.0

Embedded-friendly math library featuring fast floating point approximations (with small code size) for common arithmetic operations, trigonometry, 2D/3D vector types, statistical analysis, and quaternions. Optimizes for performance and small code size at the cost of precision.
Documentation 
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/// Arithmetic mean
pub trait Mean {
    /// Result type
    type Result;

    /// Compute the arithmetic mean
    fn mean(self) -> Self::Result;
}

impl<I> Mean for I
where
    I: Iterator<Item = f32>,
{
    type Result = f32;

    fn mean(self) -> f32 {
        let mut num_items = 0;
        let mut sum = 0.0;

        for item in self {
            num_items += 1;
            sum += item;
        }

        sum / (num_items as f32)
    }
}

#[cfg(test)]
mod tests {
    use super::Mean;

    #[test]
    fn mean_test() {
        assert_eq!([1.0, 3.0, 5.0].iter().cloned().mean(), 3.0);
    }
}